initial commit. phase 1 complete

frontend/node_modules/pretty-format/plugins/ReactElement.js

@@ -0,0 +1,74 @@
+'use strict';
+
+const printString = require('../printString');
+
+const reactElement = Symbol.for('react.element');
+
+function traverseChildren(opaqueChildren, cb) {
+  if (Array.isArray(opaqueChildren)) {
+    opaqueChildren.forEach(child => traverseChildren(child, cb));
+  } else if (opaqueChildren != null && opaqueChildren !== false) {
+    cb(opaqueChildren);
+  }
+}
+
+function printChildren(flatChildren, print, indent, opts) {
+  return flatChildren.map(node => {
+    if (typeof node === 'object') {
+      return printElement(node, print, indent, opts);
+    } else if (typeof node === 'string') {
+      return printString(node);
+    } else {
+      return print(node);
+    }
+  }).join(opts.edgeSpacing);
+}
+
+function printProps(props, print, indent, opts) {
+  return Object.keys(props).sort().map(name => {
+    if (name === 'children') {
+      return '';
+    }
+
+    const prop = props[name];
+    let printed = print(prop);
+
+    if (typeof prop !== 'string') {
+      if (printed.indexOf('\n') !== -1) {
+        printed = '{' + opts.edgeSpacing + indent(indent(printed) + opts.edgeSpacing + '}');
+      } else {
+        printed = '{' + printed + '}';
+      }
+    }
+
+    return opts.spacing + indent(name + '=') + printed;
+  }).join('');
+}
+
+function printElement(element, print, indent, opts) {
+  let result = '<' + element.type;
+  result += printProps(element.props, print, indent, opts);
+
+  const opaqueChildren = element.props.children;
+  if (opaqueChildren) {
+    let flatChildren = [];
+    traverseChildren(opaqueChildren, child => {
+      flatChildren.push(child);
+    });
+    const children = printChildren(flatChildren, print, indent, opts);
+    result += '>' + opts.edgeSpacing + indent(children) + opts.edgeSpacing + '</' + element.type + '>';
+  } else {
+    result += ' />';
+  }
+
+  return result;
+}
+
+module.exports = {
+  test(object) {
+    return object && object.$$typeof === reactElement;
+  },
+  print(val, print, indent, opts) {
+    return printElement(val, print, indent, opts);
+  }
+};